Lithium antiperovskite-derived glass solid electrolytes
In the paper 'Lithium antiperovskite-derived glass solid electrolytes' published in ACS Materials Letters, the authors* report the synthesis of Li2OHX (X=Br,CI)-based glasses. These glasses were found to be challenging to synthesise, requiring extreme cooling rates achievable only by a twin-roll quench process.
As has been speculated for antiperovskite-derived glasses, indications of improved lithium-ion dynamics were observed. Notably, spin-lattice relaxation nuclear magnetic resonance spectroscopy revealed a higher hopping frequency and significantly lower activation energy for Li2OHBr glasses (0.29 eV) compared to the crystalline Li0OHBr (0.39 eV). This may be attributable to the increased free volume in the glass samples (ρglass/ρcryst = 0.83) and a reduced ionic interaction of lithium ions with the glass structure.
Despite the promising findings, the glasses were found to be unstable under pressure, and crystallised during attempts to produce bulk samples for impedance measurements.
* Emily Milan (Oxford Materials), Gregory J Rees (Oxford Materials), Aaron Philipps (Coe College, USA), Cristian Cano (Coe College, USA), Yi Wei (Coe College, USA), Hua Guo (Oxford Materials), Steve Feller (Coe College, USA) and Professor Mauro Pasta (Oxford Materials).
